// pages/iwant/iwant.js
const length = 5;
const cls_on = 
Page({
  submit: function (e) {
    wx.showToast({
      title: '标记成功',
      icon: 'success',
      duration: 2000,
      success: function (e) {
        wx.navigateBack({
        });
      }
    })
  }
})